Nowadays my team is evaluating open source portals that have support for workflow management and BPM. Workflow is a technology in demand. Lots of people see it as complementary technology to EAI. But the problem is that each of our clients have different types of need. Commercial portals are quite matured in the case of workflow. But I didn't find extensive workflow support in any open source portal. I did a google search (as always, it thrown my pages back to me :-)) I found only two open source portals in result. One was eXo with some workflow portlets and other one was Jahia (Stéphane, I have included Jahia in open source list this time :-)) with content workflow support. I have yet to see both the products. But I guess there will be some more products that I am missing here. If I am missing some products, please let me know.